diff -Naru libpng-1.6.28.org/png.h libpng-1.6.28/png.h
--- libpng-1.6.28.org/png.h 2017-01-06 07:54:14.001821909 +0900
+++ libpng-1.6.28/png.h 2017-01-06 07:52:51.552368347 +0900
@@ -359,6 +359,10 @@
# include "pnglibconf.h"
#endif
+#define PNG_APNG_SUPPORTED
+#define PNG_READ_APNG_SUPPORTED
+#define PNG_WRITE_APNG_SUPPORTED
+
#ifndef PNG_VERSION_INFO_ONLY
/* Machine specific configuration. */
# include "pngconf.h"
@@ -454,6 +458,17 @@
* See pngconf.h for base types that vary by machine/system
*/
+#ifdef PNG_APNG_SUPPORTED
+/* dispose_op flags from inside fcTL */
+#define PNG_DISPOSE_OP_NONE 0x00U
+#define PNG_DISPOSE_OP_BACKGROUND 0x01U
+#define PNG_DISPOSE_OP_PREVIOUS 0x02U
+
+/* blend_op flags from inside fcTL */
+#define PNG_BLEND_OP_SOURCE 0x00U
+#define PNG_BLEND_OP_OVER 0x01U
+#endif /* PNG_APNG_SUPPORTED */
+
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
@@ -774,6 +789,10 @@
#define PNG_INFO_sPLT 0x2000U /* ESR, 1.0.6 */
#define PNG_INFO_sCAL 0x4000U /* ESR, 1.0.6 */
#define PNG_INFO_IDAT 0x8000U /* ESR, 1.0.6 */
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_INFO_acTL 0x10000U
+#define PNG_INFO_fcTL 0x20000U
+#endif
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
@@ -811,6 +830,10 @@
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (p
| 